drm/i915: Use expcitly fixed type in compat32 structs

I was confused shortly whether the compat was needed for the int,
until I noticed the pointer in the original.

Also remove typedef.

v2: Review from Chris.
- Add comments.
- Also change the int param in the original structure.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 9 insertions, 4 deletions

diff --git a/drivers/gpu/drm/i915/i915_ioc32.c b/drivers/gpu/drm/i915/i915_ioc32.c
index 6eec2221b44e..a5a2d5b3f44b 100644
--- a/drivers/gpu/drm/i915/i915_ioc32.c
+++ b/drivers/gpu/drm/i915/i915_ioc32.c
@@ -35,15 +35,20 @@
 #include <drm/i915_drm.h>
 #include "i915_drv.h"
 
-typedef struct drm_i915_getparam32 {
-	int param;
+struct drm_i915_getparam32 {
+	s32 param;
+	/*
+	 * We screwed up the generic ioctl struct here and used a variable-sized
+	 * pointer. Use u32 in the compat struct to match the 32bit pointer
+	 * userspace expects.
+	 */
 	u32 value;
-} drm_i915_getparam32_t;
+};
 
 static int compat_i915_getparam(struct file *file, unsigned int cmd,
 				unsigned long arg)
 {
-	drm_i915_getparam32_t req32;
+	struct drm_i915_getparam32 req32;
 	drm_i915_getparam_t __user *request;
 
 	if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))